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Hey I've built a pit style bike with a predator 212 I've upgrade the air intake and replaced the jet with .38 I believe (dont quote me on that I can check if you think that might be the problem) I made my own muffler which did boost the engine a bit and u have the governor removed. I was planning on having an 8:1 ratio but the company gave me a 12 tooth instead if a 10 tooth so it's a bit less than 8:1 with 26" tires and a torque converter the engine still feels governed when I drive it and I'm trying to figure out why my rpms get to a point and just plato so it doesnt seem like it's too weak to turn faster I'm not sure if maybe this has something to do with the Torque converter I plan on taking my bike out to the country (i live in a neighborhood that has it's own police station who have nothing to do so the moment I drive for more than up to the next street and back a couple times a cop come rolling by) to see if it can get the TC to engage over a larger distance because right now it's getting to the point where it just wants to start engaging and then I have to stop and turn around. But I'm riding on that point just before engagement for a while and that's where it seems to plato. I dint know if this is normal with TC because I'm very new to this. I tried to tell you everything I've got but if you have more questions feel free to ask.

Oh also I have the two hoses that went into the stock intake open right now I asked what to do with them but everyone seems to have different opinions so I'll ask on here if maybe you guys have any ideas maybe that's what's going on on comes from top of gas tank and the other from I believe the valve cover

Those are breather hoses. The one on the valve cover, stick a breather filter on it. Available at the parts store in your little town.
You should drive that thing down to the cop shop and show it off. Get to know them. They will probally get a kick out of it and maybe let you "carefully" use the roads to test tune.

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Think for yourself, Question authority.

Last edited by Whitetrashrocker; 02-16-2020 at 12:32 PM.
Reason: Spell check is on the bottle again.

The Following User Says Thank You to Whitetrashrocker For This Useful Post:

Those are breather hoses. The one on the valve cover, stick a breather filter on it. Available at the parts store in your little town.
You should drive that thing down to the cop shop and show it off. Get to know them. They will probally get a kick out of it and maybe let you "carefully" use the roads to test tune.

Putting stiff springs in a stock motor will only reduce power and increase cam wear. And when not under much load, can overspeed dangerously high. So on a nice flat road, you may see an extra few mph, but try that in the grass

If the motor does not have enough power/ right gear ratio to reach valve float, not much benefit

26” tires are pretty large, with an 7:1 ratio at 3600 rpm you’d be doing around 40 mph. That’s some pretty tall gearing. My guess is that your engine doesn’t have enough power or air flow to run any higher RPMs. I’m not sure what your muffler system looks like, but that could limit rpm. My kart engine is exactly the same as yours except for just a header for the exhaust. I lost almost 1000 RPMs on the top end when I switched the stock exhaust back onto the engine from the straight pipe. The airflow makes a big difference.

I’m not sure what kind of top speed you are looking for or currently getting, but I would say gearing down wouldn’t hurt. You’ll have better acceleration and most likely higher top end rpm.

Putting stiff springs in a stock motor will only reduce power and increase cam wear. And when not under much load, can overspeed dangerously high. So on a nice flat road, you may see an extra few mph, but try that in the grass

If the motor does not have enough power/ right gear ratio to reach valve float, not much benefit

I didn't notice any decrease in power at all. Any Predator 212 hemi with the governor deleted can reach valve float on flat ground or downhill especially.

It's true that a completely stock motor won't see much from them, but if you have any plans for upgrading I'd get them.

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I do karting on the side... And cars on the other side... And --- wait, how many sides do I have?

40 in a small kart is pretty fast. I don't know where you ride but Ive got wide open flat dirt. I'd love to be able to break 40mph and I can gear for it, but I find it so much funner to gear lower and have a tire fryer that tops at 30-35mph.
When the rear wants to get in front and you can drift and donuts all day long it really puts a smile on my face.

40 in a small kart is pretty fast. I don't know where you ride but Ive got wide open flat dirt. I'd love to be able to break 40mph and I can gear for it, but I find it so much funner to gear lower and have a tire fryer that tops at 30-35mph.
When the rear wants to get in front and you can drift and donuts all day long it really puts a smile on my face.

It's all about trade-offs... You can either go fast or get there fast. Sure, you can do both if you empty your bank account, but not many do it.

My goal by the end of this project is to have a bullet proof 70mph machine. I'm at 52 right now, and upgrading weekly.

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I do karting on the side... And cars on the other side... And --- wait, how many sides do I have?

40 in a small kart is pretty fast. I don't know where you ride but Ive got wide open flat dirt. I'd love to be able to break 40mph and I can gear for it, but I find it so much funner to gear lower and have a tire fryer that tops at 30-35mph.
When the rear wants to get in front and you can drift and donuts all day long it really puts a smile on my face.

Same here! Top speed is fun every once in a while, but wheelspin and gettin' sideways are way more fun, look awesome, and they're actually safer.